tools/droiddoc/src/DroidDoc.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import com.sun.javadoc.*;

import org.clearsilver.HDF;

import java.util.*;
import java.io.*;
import java.lang.reflect.Proxy;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class DroidDoc
{
    private static final String SDK_CONSTANT_ANNOTATION = "android.annotation.SdkConstant";
    private static final String SDK_CONSTANT_TYPE_ACTIVITY_ACTION = "android.annotation.SdkConstant.SdkConstantType.ACTIVITY_INTENT_ACTION";
    private static final String SDK_CONSTANT_TYPE_BROADCAST_ACTION = "android.annotation.SdkConstant.SdkConstantType.BROADCAST_INTENT_ACTION";
    private static final String SDK_CONSTANT_TYPE_SERVICE_ACTION = "android.annotation.SdkConstant.SdkConstantType.SERVICE_INTENT_ACTION";
    private static final String SDK_CONSTANT_TYPE_CATEGORY = "android.annotation.SdkConstant.SdkConstantType.INTENT_CATEGORY";
    private static final String SDK_WIDGET_ANNOTATION = "android.annotation.Widget";
    private static final String SDK_LAYOUT_ANNOTATION = "android.annotation.Layout";

    private static final int TYPE_NONE = 0;
    private static final int TYPE_WIDGET = 1;
    private static final int TYPE_LAYOUT = 2;
    private static final int TYPE_LAYOUT_PARAM = 3;
    
    public static final int SHOW_PUBLIC = 0x00000001;
    public static final int SHOW_PROTECTED = 0x00000003;
    public static final int SHOW_PACKAGE = 0x00000007;
    public static final int SHOW_PRIVATE = 0x0000000f;
    public static final int SHOW_HIDDEN = 0x0000001f;

    public static int showLevel = SHOW_PROTECTED;

    public static final String javadocDir = "reference/";
    public static String htmlExtension;

    public static RootDoc root;
    public static ArrayList<String[]> mHDFData = new ArrayList<String[]>();
    public static Map<Character,String> escapeChars = new HashMap<Character,String>();
    public static String title = "";

    public static boolean checkLevel(int level)
    {
        return (showLevel & level) == level;
    }

    public static boolean checkLevel(boolean pub, boolean prot, boolean pkgp,
            boolean priv, boolean hidden)
    {
        int level = 0;
        if (hidden && !checkLevel(SHOW_HIDDEN)) {
            return false;
        }
        if (pub && checkLevel(SHOW_PUBLIC)) {
            return true;
        }
        if (prot && checkLevel(SHOW_PROTECTED)) {
            return true;
        }
        if (pkgp && checkLevel(SHOW_PACKAGE)) {
            return true;
        }
        if (priv && checkLevel(SHOW_PRIVATE)) {
            return true;
        }
        return false;
    }
    
    public static boolean start(RootDoc r)
    {
        String keepListFile = null;
        String proofreadFile = null;
        String todoFile = null;
        String sdkValuePath = null;
        ArrayList<SampleCode> sampleCodes = new ArrayList<SampleCode>();
        String stubsDir = null;
        //Create the dependency graph for the stubs directory
        boolean apiXML = false;
        String apiFile = null;
        String debugStubsFile = "";
        HashSet<String> stubPackages = null;

        root = r;

        String[][] options = r.options();
        for (String[] a: options) {
            if (a[0].equals("-d")) {
                ClearPage.outputDir = a[1];
            }
            else if (a[0].equals("-templatedir")) {
                ClearPage.addTemplateDir(a[1]);
            }
            else if (a[0].equals("-hdf")) {
                mHDFData.add(new String[] {a[1], a[2]});
            }
            else if (a[0].equals("-toroot")) {
                ClearPage.toroot = a[1];
            }
            else if (a[0].equals("-samplecode")) {
                sampleCodes.add(new SampleCode(a[1], a[2], a[3]));
            }
            else if (a[0].equals("-htmldir")) {
                ClearPage.htmlDir = a[1];
            }
            else if (a[0].equals("-title")) {
                DroidDoc.title = a[1];
            }
            else if (a[0].equals("-werror")) {
                Errors.setWarningsAreErrors(true);
            }
            else if (a[0].equals("-error") || a[0].equals("-warning")
                    || a[0].equals("-hide")) {
                try {
                    int level = -1;
                    if (a[0].equals("-error")) {
                        level = Errors.ERROR;
                    }
                    else if (a[0].equals("-warning")) {
                        level = Errors.WARNING;
                    }
                    else if (a[0].equals("-hide")) {
                        level = Errors.HIDDEN;
                    }
                    Errors.setErrorLevel(Integer.parseInt(a[1]), level);
                }
                catch (NumberFormatException e) {
                    // already printed below
                    return false;
                }
            }
            else if (a[0].equals("-keeplist")) {
                keepListFile = a[1];
            }
            else if (a[0].equals("-proofread")) {
                proofreadFile = a[1];
            }
            else if (a[0].equals("-todo")) {
                todoFile = a[1];
            }
            else if (a[0].equals("-public")) {
                showLevel = SHOW_PUBLIC;
            }
            else if (a[0].equals("-protected")) {
                showLevel = SHOW_PROTECTED;
            }
            else if (a[0].equals("-package")) {
                showLevel = SHOW_PACKAGE;
            }
            else if (a[0].equals("-private")) {
                showLevel = SHOW_PRIVATE;
            }
            else if (a[0].equals("-hidden")) {
                showLevel = SHOW_HIDDEN;
            }
            else if (a[0].equals("-stubs")) {
                stubsDir = a[1];
            }
            else if (a[0].equals("-stubpackages")) {
                stubPackages = new HashSet();
                for (String pkg: a[1].split(":")) {
                    stubPackages.add(pkg);
                }
            }
            else if (a[0].equals("-sdkvalues")) {
                sdkValuePath = a[1];
            }
            else if (a[0].equals("-apixml")) {
                apiXML = true;
                apiFile = a[1];
            }
        }

        // read some prefs from the template
        if (!readTemplateSettings()) {
            return false;
        }

        // Set up the data structures
        Converter.makeInfo(r);

        // Files for proofreading
        if (proofreadFile != null) {
            Proofread.initProofread(proofreadFile);
        }
        if (todoFile != null) {
            TodoFile.writeTodoFile(todoFile);
        }

        // HTML Pages
        if (ClearPage.htmlDir != null) {
            writeHTMLPages();
        }

        // Navigation tree
        NavTree.writeNavTree(javadocDir);

        // Packages Pages
        writePackages(javadocDir
                        + (ClearPage.htmlDir!=null
                            ? "packages" + htmlExtension
                            : "index" + htmlExtension));

        // Classes
        writeClassLists();
        writeClasses();
        writeHierarchy();
 //      writeKeywords();

        // Lists for JavaScript
        writeLists();
        if (keepListFile != null) {
            writeKeepList(keepListFile);
        }

        // Sample Code
        for (SampleCode sc: sampleCodes) {
            sc.write();
        }

        // Index page
        writeIndex();

        Proofread.finishProofread(proofreadFile);

        // Stubs
        if (stubsDir != null) {
            Stubs.writeStubs(stubsDir, apiXML, apiFile, stubPackages);
        }
        
        if (sdkValuePath != null) {
            writeSdkValues(sdkValuePath);
        }

        Errors.printErrors();
        return !Errors.hadError;
    }

    private static void writeIndex() {
        HDF data = makeHDF();
        ClearPage.write(data, "index.cs", javadocDir + "index" + htmlExtension);
    }

    private static boolean readTemplateSettings()
    {
        HDF data = makeHDF();
        htmlExtension = data.getValue("template.extension", ".html");
        int i=0;
        while (true) {
            String k = data.getValue("template.escape." + i + ".key", "");
            String v = data.getValue("template.escape." + i + ".value", "");
            if ("".equals(k)) {
                break;
            }
            if (k.length() != 1) {
                System.err.println("template.escape." + i + ".key must have a length of 1: " + k);
                return false;
            }
            escapeChars.put(k.charAt(0), v);
            i++;
        }
        return true;
    }

    public static String escape(String s) {
        if (escapeChars.size() == 0) {
            return s;
        }
        StringBuffer b = null;
        int begin = 0;
        final int N = s.length();
        for (int i=0; i<N; i++) {
            char c = s.charAt(i);
            String mapped = escapeChars.get(c);
            if (mapped != null) {
                if (b == null) {
                    b = new StringBuffer(s.length() + mapped.length());
                }
                if (begin != i) {
                    b.append(s.substring(begin, i));
                }
                b.append(mapped);
                begin = i+1;
            }
        }
        if (b != null) {
            if (begin != N) {
                b.append(s.substring(begin, N));
            }
            return b.toString();
        }
        return s;
    }

    public static void setPageTitle(HDF data, String title)
    {
        String s = title;
        if (DroidDoc.title.length() > 0) {
            s += " - " + DroidDoc.title;
        }
        data.setValue("page.title", s);
    }

    public static LanguageVersion languageVersion()
    {
        return LanguageVersion.JAVA_1_5;
    }

    public static int optionLength(String option)
    {
        if (option.equals("-d")) {
            return 2;
        }
        if (option.equals("-templatedir")) {
            return 2;
        }
        if (option.equals("-hdf")) {
            return 3;
        }
        if (option.equals("-toroot")) {
            return 2;
        }
        if (option.equals("-samplecode")) {
            return 4;
        }
        if (option.equals("-htmldir")) {
            return 2;
        }
        if (option.equals("-title")) {
            return 2;
        }
        if (option.equals("-werror")) {
            return 1;
        }
        if (option.equals("-hide")) {
            return 2;
        }
        if (option.equals("-warning")) {
            return 2;
        }
        if (option.equals("-error")) {
            return 2;
        }
        if (option.equals("-keeplist")) {
            return 2;
        }
        if (option.equals("-proofread")) {
            return 2;
        }
        if (option.equals("-todo")) {
            return 2;
        }
        if (option.equals("-public")) {
            return 1;
        }
        if (option.equals("-protected")) {
            return 1;
        }
        if (option.equals("-package")) {
            return 1;
        }
        if (option.equals("-private")) {
            return 1;
        }
        if (option.equals("-hidden")) {
            return 1;
        }
        if (option.equals("-stubs")) {
            return 2;
        }
        if (option.equals("-stubpackages")) {
            return 2;
        }
        if (option.equals("-sdkvalues")) {
            return 2;
        }
        if (option.equals("-apixml")) {
            return 2;
        }
        return 0;
    }
    
    public static boolean validOptions(String[][] options, DocErrorReporter r)
    {
        for (String[] a: options) {
            if (a[0].equals("-error") || a[0].equals("-warning")
                    || a[0].equals("-hide")) {
                try {
                    Integer.parseInt(a[1]);
                }
                catch (NumberFormatException e) {
                    r.printError("bad -" + a[0] + " value must be a number: "
                            + a[1]);
                    return false;
                }
            }
        }

        return true;
    }

    public static HDF makeHDF()
    {
        HDF data = new HDF();

        for (String[] p: mHDFData) {
            data.setValue(p[0], p[1]);
        }

        try {
            for (String p: ClearPage.hdfFiles) {
                data.readFile(p);
            }
        }
        catch (IOException e) {
            throw new RuntimeException(e);
        }

        return data;
    }

    public static HDF makePackageHDF()
    {
        HDF data = makeHDF();
        ClassInfo[] classes = Converter.rootClasses();

        SortedMap<String, PackageInfo> sorted = new TreeMap<String, PackageInfo>();
        for (ClassInfo cl: classes) {
            PackageInfo pkg = cl.containingPackage();
            String name;
            if (pkg == null) {
                name = "";
            } else {
                name = pkg.name();
            }
            sorted.put(name, pkg);
        }

        int i = 0;
        for (String s: sorted.keySet()) {
            PackageInfo pkg = sorted.get(s);

            if (pkg.isHidden()) {
                continue;
            }
            Boolean allHidden = true;
            int pass = 0;
            ClassInfo[] classesToCheck = null;
            while (pass < 5 ) {
                switch(pass) {
                case 0:
                    classesToCheck = pkg.ordinaryClasses();
                    break;
                case 1:
                    classesToCheck = pkg.enums();
                    break;
                case 2:
                    classesToCheck = pkg.errors();
                    break;
                case 3:
                    classesToCheck = pkg.exceptions();
                    break;
                case 4:
                    classesToCheck = pkg.interfaces();
                    break;
                default:
                    System.err.println("Error reading package: " + pkg.name());
                    break;
                }
                for (ClassInfo cl : classesToCheck) {
                    if (!cl.isHidden()) {
                        allHidden = false;
                        break;
                    }
                }
                if (!allHidden) {
                    break;
                }
                pass++;
            }
            if (allHidden) {
                continue;
            }

            data.setValue("reference", "true");
            data.setValue("docs.packages." + i + ".name", s);
            data.setValue("docs.packages." + i + ".link", pkg.htmlPage());
            TagInfo.makeHDF(data, "docs.packages." + i + ".shortDescr",
                                               pkg.firstSentenceTags());
            i++;
        }

        return data;
    }

    public static void writeDirectory(File dir, String relative)
    {
        File[] files = dir.listFiles();
        int i, count = files.length;
        for (i=0; i<count; i++) {
            File f = files[i];
            if (f.isFile()) {
                String templ = relative + f.getName();
                int len = templ.length();
                if (len > 3 && ".cs".equals(templ.substring(len-3))) {
                    HDF data = makeHDF();
                    String filename = templ.substring(0,len-3) + htmlExtension;
                    ClearPage.write(data, templ, filename);
                }
                else if (len > 3 && ".jd".equals(templ.substring(len-3))) {
                    String filename = templ.substring(0,len-3) + htmlExtension;
                    DocFile.writePage(f.getAbsolutePath(), relative, filename);
                }
                else {
                    ClearPage.copyFile(f, templ);
                }
            }
            else if (f.isDirectory()) {
                writeDirectory(f, relative + f.getName() + "/");
            }
        }
    }

    public static void writeHTMLPages()
    {
        File f = new File(ClearPage.htmlDir);
        if (!f.isDirectory()) {
            System.err.println("htmlDir not a directory: " + ClearPage.htmlDir);
        }
        writeDirectory(f, "");
    }

    public static void writeLists()
    {
        HDF data = makeHDF();

        ClassInfo[] classes = Converter.rootClasses();

        SortedMap<String, Object> sorted = new TreeMap<String, Object>();
        for (ClassInfo cl: classes) {
            if (cl.isHidden()) {
                continue;
            }
            sorted.put(cl.qualifiedName(), cl);
            PackageInfo pkg = cl.containingPackage();
            String name;
            if (pkg == null) {
                name = "";
            } else {
                name = pkg.name();
            }
            sorted.put(name, pkg);
        }

        int i = 0;
        for (String s: sorted.keySet()) {
            data.setValue("docs.pages." + i + ".id" , ""+i);
            data.setValue("docs.pages." + i + ".label" , s);

            Object o = sorted.get(s);
            if (o instanceof PackageInfo) {
                PackageInfo pkg = (PackageInfo)o;
                data.setValue("docs.pages." + i + ".link" , pkg.htmlPage());
                data.setValue("docs.pages." + i + ".type" , "package");
            }
            else if (o instanceof ClassInfo) {
                ClassInfo cl = (ClassInfo)o;
                data.setValue("docs.pages." + i + ".link" , cl.htmlPage());
                data.setValue("docs.pages." + i + ".type" , "class");
            }
            i++;
        }

        ClearPage.write(data, "lists.cs", javadocDir + "lists.js");
    }

    public static void cantStripThis(ClassInfo cl, HashSet<ClassInfo> notStrippable) {
        if (!notStrippable.add(cl)) {
            // slight optimization: if it already contains cl, it already contains
            // all of cl's parents
            return;
        }
        ClassInfo supr = cl.superclass();
        if (supr != null) {
            cantStripThis(supr, notStrippable);
        }
        for (ClassInfo iface: cl.interfaces()) {
            cantStripThis(iface, notStrippable);
        }
    }

    private static String getPrintableName(ClassInfo cl) {
        ClassInfo containingClass = cl.containingClass();
        if (containingClass != null) {
            // This is an inner class.
            String baseName = cl.name();
            baseName = baseName.substring(baseName.lastIndexOf('.') + 1);
            return getPrintableName(containingClass) + '$' + baseName;
        }
        return cl.qualifiedName();
    }

    /**
     * Writes the list of classes that must be present in order to
     * provide the non-hidden APIs known to javadoc.
     *
     * @param filename the path to the file to write the list to
     */
    public static void writeKeepList(String filename) {
        HashSet<ClassInfo> notStrippable = new HashSet<ClassInfo>();
        ClassInfo[] all = Converter.allClasses();
        Arrays.sort(all); // just to make the file a little more readable

        // If a class is public and not hidden, then it and everything it derives
        // from cannot be stripped.  Otherwise we can strip it.
        for (ClassInfo cl: all) {
            if (cl.isPublic() && !cl.isHidden()) {
                cantStripThis(cl, notStrippable);
            }
        }
        PrintStream stream = null;
        try {
            stream = new PrintStream(filename);
            for (ClassInfo cl: notStrippable) {
                stream.println(getPrintableName(cl));
            }
        }
        catch (FileNotFoundException e) {
            System.err.println("error writing file: " + filename);
        }
        finally {
            if (stream != null) {
                stream.close();
            }
        }
    }

    private static PackageInfo[] sVisiblePackages = null;
    public static PackageInfo[] choosePackages() {
        if (sVisiblePackages != null) {
            return sVisiblePackages;
        }

        ClassInfo[] classes = Converter.rootClasses();
        SortedMap<String, PackageInfo> sorted = new TreeMap<String, PackageInfo>();
        for (ClassInfo cl: classes) {
            PackageInfo pkg = cl.containingPackage();
            String name;
            if (pkg == null) {
                name = "";
            } else {
                name = pkg.name();
            }
            sorted.put(name, pkg);
        }

        ArrayList<PackageInfo> result = new ArrayList();

        for (String s: sorted.keySet()) {
            PackageInfo pkg = sorted.get(s);

            if (pkg.isHidden()) {
                continue;
            }
            Boolean allHidden = true;
            int pass = 0;
            ClassInfo[] classesToCheck = null;
            while (pass < 5 ) {
                switch(pass) {
                case 0:
                    classesToCheck = pkg.ordinaryClasses();
                    break;
                case 1:
                    classesToCheck = pkg.enums();
                    break;
                case 2:
                    classesToCheck = pkg.errors();
                    break;
                case 3:
                    classesToCheck = pkg.exceptions();
                    break;
                case 4:
                    classesToCheck = pkg.interfaces();
                    break;
                default:
                    System.err.println("Error reading package: " + pkg.name());
                    break;
                }
                for (ClassInfo cl : classesToCheck) {
                    if (!cl.isHidden()) {
                        allHidden = false;
                        break;
                    }
                }
                if (!allHidden) {
                    break;
                }
                pass++;
            }
            if (allHidden) {
                continue;
            }

            result.add(pkg);
        }

        sVisiblePackages = result.toArray(new PackageInfo[result.size()]);
        return sVisiblePackages;
    }

    public static void writePackages(String filename)
    {
        HDF data = makePackageHDF();

        int i = 0;
        for (PackageInfo pkg: choosePackages()) {
            writePackage(pkg);

            data.setValue("docs.packages." + i + ".name", pkg.name());
            data.setValue("docs.packages." + i + ".link", pkg.htmlPage());
            TagInfo.makeHDF(data, "docs.packages." + i + ".shortDescr",
                            pkg.firstSentenceTags());

            i++;
        }

        setPageTitle(data, "Package Index");

        TagInfo.makeHDF(data, "root.descr",
                Converter.convertTags(root.inlineTags(), null));

        ClearPage.write(data, "packages.cs", filename);
        ClearPage.write(data, "package-list.cs", javadocDir + "package-list");

        Proofread.writePackages(filename,
                Converter.convertTags(root.inlineTags(), null));
    }

    public static void writePackage(PackageInfo pkg)
    {
        // these this and the description are in the same directory,
        // so it's okay
        HDF data = makePackageHDF();

        String name = pkg.name();

        data.setValue("package.name", name);
        data.setValue("package.descr", "...description...");

        makeClassListHDF(data, "package.interfaces", 
                         ClassInfo.sortByName(pkg.interfaces()));
        makeClassListHDF(data, "package.classes",
                         ClassInfo.sortByName(pkg.ordinaryClasses()));
        makeClassListHDF(data, "package.enums",
                         ClassInfo.sortByName(pkg.enums()));
        makeClassListHDF(data, "package.exceptions",
                         ClassInfo.sortByName(pkg.exceptions()));
        makeClassListHDF(data, "package.errors",
                         ClassInfo.sortByName(pkg.errors()));
        TagInfo.makeHDF(data, "package.shortDescr",
                         pkg.firstSentenceTags());
        TagInfo.makeHDF(data, "package.descr", pkg.inlineTags());

        String filename = pkg.htmlPage();
        setPageTitle(data, name);
        ClearPage.write(data, "package.cs", filename);

        filename = pkg.fullDescriptionHtmlPage();
        setPageTitle(data, name + " Details");
        ClearPage.write(data, "package-descr.cs", filename);

        Proofread.writePackage(filename, pkg.inlineTags());
    }

    public static void writeClassLists()
    {
        int i;
        HDF data = makePackageHDF();

        ClassInfo[] classes = PackageInfo.filterHidden(
                                    Converter.convertClasses(root.classes()));
        if (classes.length == 0) {
            return ;
        }

        Sorter[] sorted = new Sorter[classes.length];
        for (i=0; i<sorted.length; i++) {
            ClassInfo cl = classes[i];
            String name = cl.name();
            sorted[i] = new Sorter(name, cl);
        }

        Arrays.sort(sorted);

        // make a pass and resolve ones that have the same name
        int firstMatch = 0;
        String lastName = sorted[0].label;
        for (i=1; i<sorted.length; i++) {
            String s = sorted[i].label;
            if (!lastName.equals(s)) {
                if (firstMatch != i-1) {
                    // there were duplicates
                    for (int j=firstMatch; j<i; j++) {
                        PackageInfo pkg = ((ClassInfo)sorted[j].data).containingPackage();
                        if (pkg != null) {
                            sorted[j].label = sorted[j].label + " (" + pkg.name() + ")";
                        }
                    }
                }
                firstMatch = i;
                lastName = s;
            }
        }

        // and sort again
        Arrays.sort(sorted);

        for (i=0; i<sorted.length; i++) {
            String s = sorted[i].label;
            ClassInfo cl = (ClassInfo)sorted[i].data;
            char first = Character.toUpperCase(s.charAt(0));
            cl.makeShortDescrHDF(data, "docs.classes." + first + '.' + i);
        }

        setPageTitle(data, "Class Index");
        ClearPage.write(data, "classes.cs", javadocDir + "classes" + htmlExtension);
    }

    // we use the word keywords because "index" means something else in html land
    // the user only ever sees the word index
/*    public static void writeKeywords()
    {
        ArrayList<KeywordEntry> keywords = new ArrayList<KeywordEntry>();

        ClassInfo[] classes = PackageInfo.filterHidden(Converter.convertClasses(root.classes()));

        for (ClassInfo cl: classes) {
            cl.makeKeywordEntries(keywords);
        }

        HDF data = makeHDF();

        Collections.sort(keywords);
        
        int i=0;
        for (KeywordEntry entry: keywords) {
            String base = "keywords." + entry.firstChar() + "." + i;
            entry.makeHDF(data, base);
            i++;
        }

        setPageTitle(data, "Index");
        ClearPage.write(data, "keywords.cs", javadocDir + "keywords" + htmlExtension);
    } */

    public static void writeHierarchy()
    {
        ClassInfo[] classes = Converter.rootClasses();
        ArrayList<ClassInfo> info = new ArrayList<ClassInfo>();
        for (ClassInfo cl: classes) {
            if (!cl.isHidden()) {
                info.add(cl);
            }
        }
        HDF data = makePackageHDF();
        Hierarchy.makeHierarchy(data, info.toArray(new ClassInfo[info.size()]));
        setPageTitle(data, "Class Hierarchy");
        ClearPage.write(data, "hierarchy.cs", javadocDir + "hierarchy" + htmlExtension);
    }

    public static void writeClasses()
    {
        ClassInfo[] classes = Converter.rootClasses();

        for (ClassInfo cl: classes) {
            HDF data = makePackageHDF();
            if (!cl.isHidden()) {
                writeClass(cl, data);
            }
        }
    }

    public static void writeClass(ClassInfo cl, HDF data)
    {
        cl.makeHDF(data);

        setPageTitle(data, cl.name());
        ClearPage.write(data, "class.cs", cl.htmlPage());

        Proofread.writeClass(cl.htmlPage(), cl);
    }

    public static void makeClassListHDF(HDF data, String base,
            ClassInfo[] classes)
    {
        for (int i=0; i<classes.length; i++) {
            ClassInfo cl = classes[i];
            if (!cl.isHidden()) {
                cl.makeShortDescrHDF(data, base + "." + i);
            }
        }
    }

    public static String linkTarget(String source, String target)
    {
        String[] src = source.split("/");
        String[] tgt = target.split("/");

        int srclen = src.length;
        int tgtlen = tgt.length;

        int same = 0;
        while (same < (srclen-1)
                && same < (tgtlen-1)
                && (src[same].equals(tgt[same]))) {
            same++;
        }

        String s = "";

        int up = srclen-same-1;
        for (int i=0; i<up; i++) {
            s += "../";
        }


        int N = tgtlen-1;
        for (int i=same; i<N; i++) {
            s += tgt[i] + '/';
        }
        s += tgt[tgtlen-1];

        return s;
    }

    /**
     * Returns true if the given element has an @hide annotation.
     */
    private static boolean hasHideAnnotation(Doc doc) {
        return doc.getRawCommentText().indexOf("@hide") != -1;
    }

    /**
     * Returns true if the given element is hidden.
     */
    private static boolean isHidden(Doc doc) {
        // Methods, fields, constructors.
        if (doc instanceof MemberDoc) {
            return hasHideAnnotation(doc);
        }

        // Classes, interfaces, enums, annotation types.
        if (doc instanceof ClassDoc) {
            ClassDoc classDoc = (ClassDoc) doc;

            // Check the containing package.
            if (hasHideAnnotation(classDoc.containingPackage())) {
                return true;
            }

            // Check the class doc and containing class docs if this is a
            // nested class.
            ClassDoc current = classDoc;
            do {
                if (hasHideAnnotation(current)) {
                    return true;
                }

                current = current.containingClass();
            } while (current != null);
        }

        return false;
    }

    /**
     * Filters out hidden elements.
     */
    private static Object filterHidden(Object o, Class<?> expected) {
        if (o == null) {
            return null;
        }

        Class type = o.getClass();
        if (type.getName().startsWith("com.sun.")) {
            // TODO: Implement interfaces from superclasses, too.
            return Proxy.newProxyInstance(type.getClassLoader(),
                    type.getInterfaces(), new HideHandler(o));
        } else if (o instanceof Object[]) {
            Class<?> componentType = expected.getComponentType();
            Object[] array = (Object[]) o;
            List<Object> list = new ArrayList<Object>(array.length);
            for (Object entry : array) {
                if ((entry instanceof Doc) && isHidden((Doc) entry)) {
                    continue;
                }
                list.add(filterHidden(entry, componentType));
            }
            return list.toArray(
                    (Object[]) Array.newInstance(componentType, list.size()));
        } else {
            return o;
        }
    }

    /**
     * Filters hidden elements out of method return values.
     */
    private static class HideHandler implements InvocationHandler {

        private final Object target;

        public HideHandler(Object target) {
            this.target = target;
        }

        public Object invoke(Object proxy, Method method, Object[] args)
                throws Throwable {
            String methodName = method.getName();
            if (args != null) {
                if (methodName.equals("compareTo") ||
                    methodName.equals("equals") ||
                    methodName.equals("overrides") ||
                    methodName.equals("subclassOf")) {
                    args[0] = unwrap(args[0]);
                }
            }

            if (methodName.equals("getRawCommentText")) {
                return filterComment((String) method.invoke(target, args));
            }
            
            // escape "&" in disjunctive types.
            if (proxy instanceof Type && methodName.equals("toString")) {
                return ((String) method.invoke(target, args))
                        .replace("&", "&amp;");
            }

            try {
                return filterHidden(method.invoke(target, args),
                        method.getReturnType());
            } catch (InvocationTargetException e) {
                throw e.getTargetException();
            }
        }

        private String filterComment(String s) {
            if (s == null) {
                return null;
            }

            s = s.trim();

            // Work around off by one error
            while (s.length() >= 5
                    && s.charAt(s.length() - 5) == '{') {
                s += "&nbsp;";
            }

            return s;
        }

        private static Object unwrap(Object proxy) {
            if (proxy instanceof Proxy)
                return ((HideHandler)Proxy.getInvocationHandler(proxy)).target;
            return proxy;
        }
    }

    public static String scope(Scoped scoped) {
        if (scoped.isPublic()) {
            return "public";
        }
        else if (scoped.isProtected()) {
            return "protected";
        }
        else if (scoped.isPackagePrivate()) {
            return "";
        }
        else if (scoped.isPrivate()) {
            return "private";
        }
        else {
            throw new RuntimeException("invalid scope for object " + scoped);
        }
    }
    
    /**
     * Collect the values used by the Dev tools and write them in files packaged with the SDK
     * @param output the ouput directory for the files.
     */
    private static void writeSdkValues(String output) {
        ArrayList<String> activityActions = new ArrayList<String>();
        ArrayList<String> broadcastActions = new ArrayList<String>();
        ArrayList<String> serviceActions = new ArrayList<String>();
        ArrayList<String> categories = new ArrayList<String>();
        
        ArrayList<ClassInfo> layouts = new ArrayList<ClassInfo>();
        ArrayList<ClassInfo> widgets = new ArrayList<ClassInfo>();
        ArrayList<ClassInfo> layoutParams = new ArrayList<ClassInfo>();
        
        ClassInfo[] classes = Converter.allClasses();

        // Go through all the fields of all the classes, looking SDK stuff.
        for (ClassInfo clazz : classes) {
            
            // first check constant fields for the SdkConstant annotation.
            FieldInfo[] fields = clazz.allSelfFields();
            for (FieldInfo field : fields) {
                Object cValue = field.constantValue();
                if (cValue != null) {
                    AnnotationInstanceInfo[] annotations = field.annotations();
                    if (annotations.length > 0) {
                        for (AnnotationInstanceInfo annotation : annotations) {
                            if (SDK_CONSTANT_ANNOTATION.equals(annotation.type().qualifiedName())) {
                                AnnotationValueInfo[] values = annotation.elementValues();
                                if (values.length > 0) {
                                    String type = values[0].valueString();
                                    if (SDK_CONSTANT_TYPE_ACTIVITY_ACTION.equals(type)) {
                                        activityActions.add(cValue.toString());
                                    } else if (SDK_CONSTANT_TYPE_BROADCAST_ACTION.equals(type)) {
                                        broadcastActions.add(cValue.toString());
                                    } else if (SDK_CONSTANT_TYPE_SERVICE_ACTION.equals(type)) {
                                        serviceActions.add(cValue.toString());
                                    } else if (SDK_CONSTANT_TYPE_CATEGORY.equals(type)) {
                                        categories.add(cValue.toString());
                                    }
                                }
                                break;
                            }
                        }
                    }
                }
            }
            
            // Now check the class for @Widget or if its in the android.widget package
            // (unless the class is hidden or abstract, or non public)
            if (clazz.isHidden() == false && clazz.isPublic() && clazz.isAbstract() == false) {
                boolean annotated = false;
                AnnotationInstanceInfo[] annotations = clazz.annotations();
                if (annotations.length > 0) {
                    for (AnnotationInstanceInfo annotation : annotations) {
                        if (SDK_WIDGET_ANNOTATION.equals(annotation.type().qualifiedName())) {
                            widgets.add(clazz);
                            annotated = true;
                            break;
                        } else if (SDK_LAYOUT_ANNOTATION.equals(annotation.type().qualifiedName())) {
                            layouts.add(clazz);
                            annotated = true;
                            break;
                        }
                    }
                }
                
                if (annotated == false) {
                    // lets check if this is inside android.widget
                    PackageInfo pckg = clazz.containingPackage();
                    String packageName = pckg.name();
                    if ("android.widget".equals(packageName) ||
                            "android.view".equals(packageName)) {
                        // now we check what this class inherits either from android.view.ViewGroup
                        // or android.view.View, or android.view.ViewGroup.LayoutParams
                        int type = checkInheritance(clazz);
                        switch (type) {
                            case TYPE_WIDGET:
                                widgets.add(clazz);
                                break;
                            case TYPE_LAYOUT:
                                layouts.add(clazz);
                                break;
                            case TYPE_LAYOUT_PARAM:
                                layoutParams.add(clazz);
                                break;
                        }
                    }
                }
            }
        }

        // now write the files, whether or not the list are empty.
        // the SDK built requires those files to be present.

        Collections.sort(activityActions);
        writeValues(output + "/activity_actions.txt", activityActions);

        Collections.sort(broadcastActions);
        writeValues(output + "/broadcast_actions.txt", broadcastActions);

        Collections.sort(serviceActions);
        writeValues(output + "/service_actions.txt", serviceActions);

        Collections.sort(categories);
        writeValues(output + "/categories.txt", categories);
        
        // before writing the list of classes, we do some checks, to make sure the layout params
        // are enclosed by a layout class (and not one that has been declared as a widget)
        for (int i = 0 ; i < layoutParams.size();) {
            ClassInfo layoutParamClass = layoutParams.get(i);
            ClassInfo containingClass = layoutParamClass.containingClass();
            if (containingClass == null || layouts.indexOf(containingClass) == -1) {
                layoutParams.remove(i);
            } else {
                i++;
            }
        }
        
        writeClasses(output + "/widgets.txt", widgets, layouts, layoutParams);
    }
    
    /**
     * Writes a list of values into a text files.
     * @param pathname the absolute os path of the output file.
     * @param values the list of values to write.
     */
    private static void writeValues(String pathname, ArrayList<String> values) {
        FileWriter fw = null;
        BufferedWriter bw = null;
        try {
            fw = new FileWriter(pathname, false);
            bw = new BufferedWriter(fw);
            
            for (String value : values) {
                bw.append(value).append('\n');
            }
        } catch (IOException e) {
            // pass for now
        } finally {
            try {
                if (bw != null) bw.close();
            } catch (IOException e) {
                // pass for now
            }
            try {
                if (fw != null) fw.close();
            } catch (IOException e) {
                // pass for now
            }
        }
    }

    /**
     * Writes the widget/layout/layout param classes into a text files.
     * @param pathname the absolute os path of the output file.
     * @param widgets the list of widget classes to write.
     * @param layouts the list of layout classes to write.
     * @param layoutParams the list of layout param classes to write.
     */
    private static void writeClasses(String pathname, ArrayList<ClassInfo> widgets,
            ArrayList<ClassInfo> layouts, ArrayList<ClassInfo> layoutParams) {
        FileWriter fw = null;
        BufferedWriter bw = null;
        try {
            fw = new FileWriter(pathname, false);
            bw = new BufferedWriter(fw);
            
            // write the 3 types of classes.
            for (ClassInfo clazz : widgets) {
                writeClass(bw, clazz, 'W');
            }
            for (ClassInfo clazz : layoutParams) {
                writeClass(bw, clazz, 'P');
            }
            for (ClassInfo clazz : layouts) {
                writeClass(bw, clazz, 'L');
            }
        } catch (IOException e) {
            // pass for now
        } finally {
            try {
                if (bw != null) bw.close();
            } catch (IOException e) {
                // pass for now
            }
            try {
                if (fw != null) fw.close();
            } catch (IOException e) {
                // pass for now
            }
        }
    }

    /**
     * Writes a class name and its super class names into a {@link BufferedWriter}.
     * @param writer the BufferedWriter to write into
     * @param clazz the class to write
     * @param prefix the prefix to put at the beginning of the line.
     * @throws IOException
     */
    private static void writeClass(BufferedWriter writer, ClassInfo clazz, char prefix)
            throws IOException {
        writer.append(prefix).append(clazz.qualifiedName());
        ClassInfo superClass = clazz;
        while ((superClass = superClass.superclass()) != null) {
            writer.append(' ').append(superClass.qualifiedName());
        }
        writer.append('\n');
    }
    
    /**
     * Checks the inheritance of {@link ClassInfo} objects. This method return
     * <ul>
     * <li>{@link #TYPE_LAYOUT}: if the class extends <code>android.view.ViewGroup</code></li>
     * <li>{@link #TYPE_WIDGET}: if the class extends <code>android.view.View</code></li>
     * <li>{@link #TYPE_LAYOUT_PARAM}: if the class extends <code>android.view.ViewGroup$LayoutParams</code></li>
     * <li>{@link #TYPE_NONE}: in all other cases</li>
     * </ul> 
     * @param clazz the {@link ClassInfo} to check.
     */
    private static int checkInheritance(ClassInfo clazz) {
        if ("android.view.ViewGroup".equals(clazz.qualifiedName())) {
            return TYPE_LAYOUT;
        } else if ("android.view.View".equals(clazz.qualifiedName())) {
            return TYPE_WIDGET;
        } else if ("android.view.ViewGroup.LayoutParams".equals(clazz.qualifiedName())) {
            return TYPE_LAYOUT_PARAM;
        }
        
        ClassInfo parent = clazz.superclass();
        if (parent != null) {
            return checkInheritance(parent);
        }
        
        return TYPE_NONE;
    }
}